Mold for forming pieces of carbon for electric purposes



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No. 376,019. Patented Jan. 3, 1888.

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C. H. WILDER.

MOLD FOR FORMING PIECES OF CARBON FOR ELECTRIC PURPOSES.

No. 376,019. Patented Jan. 3, 1888.

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ORMING PIECES OF CARBON FOR ELECTRIC PURPO$ES.

MOLD FOR F No. 376,019.

Patented Jan. 3, 1888.

UNITED STATES PATENT Ori ice.

CHARLES WILDER, OF NATICK, MASSACElUSETTS, ASSIGNOR TO THE HUB CARBON COMPANY, OF KENNEBUNK, MAINE.

MOLD FOR FORMING PIECES OF CARBON FOR ELECTRIC PURPOSES.

JPECIPICATION forming part of Letters Patent No. 376,0] 9, dated January 3, 1888.

Application tiled FebrumyQG, 1887. Serial No. 229,068. (No model.)

'ing to provide a simple and effectualapparatus by which a hollow cylindrical piece of carbon can be formed and baked ready for use; and

it consists in the construction and relative arrangement of the several parts which together constitute the complete mold, as hereinafter described, and illustrated by the drawings.

The mold consists of a pedestal or, base, a core which is a vertical cylinder out longitudinally in three pieces, with a stem at the bottom which sets in a socket in the pedestal, an

outer wall of diameter enough greater than that of the core to make space between them, in which to pack the substance which is to make a hollow cylindrical piece of carbon made of two pieces of sheet metal, one within the other, secured in place byjoiuted metallic hoops, a piece of sheet metal closely enveloping the core, and a cast-iron cap or head for both ends of the mold. when the core is removed and clamps to hold the heads in place.

Figure 1 shows a perspective of the base or pedestal on which the other parts of the mold are erected and sustained. This is a rectangular block out in two equal parts on a line through the middle, with a hinge at one end .upon which it will open and a ,hasp and staple at the opposite end by which the two parts are secured in contact with each other. In the-center of this pedestal is a hole through it, which is a socket, in which a stem at the bottom of thecore of the mold will stand and thick ends downward-the three pieces together making a solid cylinder. Fig. 2is a top horizontal plan of Fig. 1, showing in the socket across section of the core of the mold in it, and the hinge and hasp which secure the two parts of the pedestal together. Fig. 3 is a'vertical inside face view of one of the side pieces of the core of the mold and a cross-section of the same on the line Z. Fig. 4 is a side elevation of the core with the loose side piece off. Fig. 5 is an edge view of one of the side pieces of the core shown in Fig. 3. Fig. 6 is a vertical longitudinal section of the pedestal, core, and outside shell of the mold with the carbon piece in its place between the shell and the core. Fig. 7 is a vertical sectional view of the mold with the carbon formed in the space for it, the core removed, the heads placed on both ends of it and clasped in place, and the space where the core was filled with sand, the whole ready to be placed in the cokingoven. Fig. 8 shows a vertical perspective of the outer wall of mold, between which and the core the material for the carbon piece is packed with adjustable hoops. This is a double wall of two separate pieces of sheet metal, both cut open vertically, the edges of the inner one abut-ting and the edges of the outer one lapping over each other. Fig. 9 shows a perspective of the carbon piece completed, a piece broken out to show the thickness of its walls with a post formed on the top edge integral with the body ot'it. Fig. 10'shows a perspective of the top head of the mold with a form for the post on the top edge of the carbon. Fig. 11 shows a perspective of the bottom head of the mold. Fig. 12 shows a jointed hoop used to secure the vertical wall of the mold, as shown in Fig. 8. Fig. 13 shows a top edge of a carbon piece with a post on the side of it. Fig. 14 shows a crosssection of the core, with an envelope of sheetiron around it to separate it from the carbon.

at marks the socket in the pedestal.

a marks the core, cut in three pieces, with its stem at the bottom to set in the socket in.

the pedestal, and a similar one at the top to handle it by and withdraw the middle wedge- .shaped piece when it is to be removed from which cylindrical form, one within the other, the edges of the inner one abutting and the edges of the outer lapping by. These are secured by two metallic hoops,bothjointed and hinged.

a marks the inner wall of the mold, which is also a sheet of iron wrapped around and on the surface of the core.

it marks the carbon piece in the mold.

a marks the top head for the mold on the mold, showing the elevation for the post on the carbon.

a marks the lower head of the mold.

a marks the clamps which hold the heads of the mold on. When the heads are on, the hoops may be removed.

a marks the space in the center of the mold from which the core has been removed before the heads are put on, and which is filled with sand, which remains there while the mold with the carbon is in the eoking-oven and until it is cooled so that it can be handled.

a marks the jointed hoops which encircle the outer shell of the mold.

\Vhen the core a is set in the socket in the pedestal with its covering ofsheet-iron around it, and the outer shell of the mold placed in its groove on the pedestal and encircled by its hoops, the mold is ready for the materials which are to make the formed carbon piece in it, which are ofpulverized coke mixed with a combination of roofers pitch and coal-tar, to make its particles cohere. The mixture of coke and pitch and tar, as thick as stiffmortar, is then, by pressure or ram ming,forced into the space between the outer shell of the mold and the core. The amount of force or ramming will determine the density of the carbon piece. The elevation on the top of the upper head is also filled with the mixed coke to make the post on the top edge of the carbon piece. The core is then withdrawn, and also the sheetiron envelope which inclosed it. I then prepare a lining which will fit the inside of the carbon as it is in the mold of paper coated with graphite, and put it in place. I then return the sheet-iron lining to its place within the carbon. I then place the top head on the mold, and turn the mold over so that the bottom end of the mold is upward. I then fill the cavity where the core was with sand, and then put the bottom head in place and secure it by clamps. The mold,with the carbon in it, is then ready for the eokingoven. The paper lining coated with graphite is for the purpose of preventing the plastic mass from adhering to the metal lining, and it falls to pieces after the coked carbon comes out of the mold. The whole is placed in an oven or furnace and heated to a bright red for about two or three hours, which will convert the roofers pitch and tar in the substance in the mold into coke, so that the whole of the substance of the formed piece in the mold is coke. \Vhen it has all become coke, the mold, with its contents,is taken out of the coking-oven and buried deep in a bed of sand or ashes, where it is allowed to remain until cool enough to be handled. After the formed carbon has been removed from the mold, it is ready for use again.

I have above described a mold suitable for only one form of carbon piece, but the important useful features of the mold may be combined in molds for other forms. The metallic substance of the walls and heads of the mold are expanded by the heat during the baking or coking of the carbon piece in it, as well as the carbon piece; but when cooled, the oven contracts, but the carbon piece does not contract, and it would be crushed and spoiled by the contraction of the iron if the outer wall of the mold was not cut open longitudinally, so that it can accommodate the rigidity of the carbon; and a similar result would ensue if the inside sheet-iron lining was not cut longitudinally.

I claim as new, and my invention- 1. The combination of the pedestal, the sectional core composed of wedge-shaped sections, the sheet-metal envelope surrounding said core, and the outer shell of larger diame ter encircling the core and its envelope, substantially as described.

2. The combination of the pedestal having a socket, the sectional core provided with astem for said socket, and the outer wall of larger diameter than said core and surrounding the latter, substantially as described.

3. In a mold for forming'cylindrical carbon pieces, the lining of graphite paper between the carbon and the inner metallic wall of the mold.

4. In a mold for forming pieces 01' pure coke-carbon of cylindrical form, in eombination with the heads of the mold, vertical outer and inner walls of sheet metal cut open longitudinally, substantially as described.

5. The combination of the inner sheet-metal lining, the sand filling within said lining, the graphite lining outside said sheet-metal lining, the outer wall of larger diameter for inelosing the annular carbon between it and said inner lining and the heads,substautial ly as described.

6. The combination of the inuersheet-metal lining, the sand filling within said lining, the graphitelining outside said sheet-metal lining, the outer wall of larger diameter forinclosing the annular carbon between it and said inner lining and the heads, one of which is provided with a hollow elevation, substantially as described.

7. The above described improved mold for forming hollow cylindrical pieces of coke-earbon, consisting of the pedestal with a socket in it, the cylindrical core of wcdgeshaped sections having a stem to enter the socket in the pedestal, the sheet metal detachable envelope around the core, and an outer shell of larger diameter surrounding the core and its envelope, substantially as described.

CHA RLES H. IVILDER.

Witnesses:

011s. HOUGHTON, LUKE A. WILDER. 

